Radio/wireless control should interact with rfkill

[dsd]

sugar-0.84 included code to make the "Radio" checkbox in the Network control panel interact with the rfkill command. This allowed for extra power saving on OLPC.

Looks like this code never went forward into master (sorry about that - wasn't me!). It would be nice to have the functionality back.

In addition to enabling rfkill, it should create a marker file (e.g. $HOME/.rfkill_block_wifi) so that init scripts can reinforce that choice on next boot.

At the same time, it is probably worth revisiting the "Extreme power management" option in the power control panel; this option is supposed to disable the wireless radio by calling into ohm. ohm is a pretty dead project.